Balanced slide-valve.



' 10.72135 YPATENTED FEB. 24, 1903.,

J. CLAYTON.

BALANCED SLIDE VALVE;

APPLIOATION FILED JAN. 25, 1902.

I0 19mm. V I 2 SHEETS-SHEET 1 PATENTED FEB. 24,'1 9o,3;

J. CLAYTON. BALANCED SLIDE VALVE. rum-r1011 rILmi JAN. 2a, 1002.

2 SHEETSBHEBI 2 I0 IODEL.

: uonms PETERS 00.. PHOTO-"TKO" wan UNITED STATE PATENT OFFICE.

JAMES CLAYTON, OF. BROOKLYN, NEW YORK.

BALANCEDVSLIDE-VALVE.

SPECIFICATION forming part of Letters Patent N 0. 721,356, dated February 24, 1903. Application filed January 25, 1902. Serial No. 91,143- (No model.)

means for balancing the slide-valve, so as to prevent as far as possiblefthe Wear on the valve by taking most of the weight or pressure of the steam eff the back of the valve.

A further object is to provide means for reducing the pressure upon the back ofvthe' valve, together with means for testing the pressure upon the back of the valve to ascertain whether the reducing or balance chamber is leaking.

A practical embodiment of my invention is represented in the accompanying drawings, in which Figure 1 is a longitudinal central section through an engine-cylinder and its valvechest. Fig. 2 is an exterior view of a portion of the cylinder and its valve-chest, the cover of the valve-chest being removed to show the chamber on the back of the valve and the spring-actuated packing-ring therein. Fig. 3 is a transverse section, on a smaller scale,

through the cylinder and valve-chest, showing a pipe leading from the exhaust-pipe into communication with the chamber on the back of the valve, an indicator connected to said pipe, and cocks for opening and closing communication between the exhaust-pipe and the chamber on the back of the valve and between the said chamber and the indicator to throw the steam on the gage. Fig. 4 is an enlarged sectional view of the spring actu'ated packing-ring for the back of the valve; and Fig. 5 is a view similar to Fig. 3, showing a modified form in which the eXhaust-portis directly connected with the chamber on the back of the valve by means of a port extending through the said valve.

The cylinder is denoted by 1, and the piston therein by 2. i

The valve-chest comprises a casing 3, containing the steam-space 4, the cylinder-ports 5 and 5, communicating with the ends of the cylinder, and an intermediate exhaust-port f7, and a cover 8 for inclosing the steam-space.

The inlet for the steam-space in the valvechest is denoted by 9.

The slide-valve within the valve-chest is denoted by 10, and it is operated by the usual valve-rod 11.- This valve 10 is provided in its face with the usual exhaust-port 12 for alternately connecting the steam-ports 5 and 6 with the exhaust-port 7.

The-valve 10- is provided with a" chamber '13 on its back, which chamber is separated from thesteam-space 4 by a spring-actuated I ackin -rin which has a slidin en 'a e- 23 7 b b D mentwith the inner face of the cover 8 of the valve-chest as the'valve is reciprocated.

' .reception of extension-springs 17, the said springs being engaged by the back of the valve for forcing the packing-ring and valve apart into engagement with their respective surfaces. In the present instance I have shown four of these sockets 16 and extension-springs 17. This chamber 13 on the back of the valve 10 is connected to the cylinder exhaust-port 7 for equalizing the pressure upon the valve.

In the form shown in .Fig. 3 the chamber v13 is connected to the exhaust-port 7 by means of a pipe 18, extending from the said chamber 13-to anexhaust-pipe 19, leading from the exhaustport 7.

In Fig. 5 I have shown the chamber 13 and eXhaust-port7 directly connected by means of a port 20,extending through the valve 10 from its exhaust-port 12 to the said chamber 13.

In the form shown in Fig. 3 I have provided the connecting-pipe 18 with apressure indicator or gage 21, connected to the said pipe 18 through a short pipe 22, within which there is provided a cut-oft valve 23. I have also provided the said connecting-pipe 18 with a cut-0E valve 24 intermediate the pressureindicator 21 and the exhaust-pipe 19. A valve 25 is also provided in the connectingpipe 18 between the pressure-indicator and the chamber 13. An extension 26 of the'pipe 18 leads from the said valve 25, which valve is arranged to open communication from the interior of the chamber to the exterior through the extension 26 or open communication from the said chamber to the pipe 18. By this arrangement it will be seen that the pressure within the chamber 13 is accurately indicated by connecting the said chamber with the pressure -indicator, so as to disclose the exact pressure within the said chamber, and thereby ascertain whether the valve is leaking or not. This is done by opening the valve 23, closing the valve 24, and turning the valve 25 so as to open communication from the chamber to the indicator and closing it from the chamber to the exterior. By opening the valve 24 open communication is established from the cylinder exhaust-port 7 to the chamber 13.

By the use of the device, as above described, it will be seen that the valve may be accurately balanced within the valve-chest, so as to insure its working with a minimum amount of frictionland Wear, because of the reduction of the live steam upon the back of the valve.

What I claim is- In combination, a steam-cylinder, a valvechest therefor, a valve fitted to slide in the valve chest, said valve having a chamber therein separated from the steam-space within the valve-chest, a pipe leading from the cylinder-exhaust to the chamber and to the exterior and a valve for opening and closing communication between the chamber and the exhaust and between the chamber and the exterior, substantially as set forth.

In testimony that I claim the foregoing as my invention I have signed my name, in presence of two witnesses, this 20th day of January, 1902.

JAMES CLAYTON.

Witnesses:

. FREDK. HAYNES,

HENRY THIEME. 

